<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
  <div id="app">
    <input type="number" v-model.number="message">
    <h1>{{message}}</h1>
  </div>

<!--  <script src="E:\idea_workspace\study\vue\vue.min.js"></script>-->
  <script src="https://unpkg.com/vue/dist/vue.min.js"></script>

<script>
  var app = new Vue({
    el: '#app',
    data: {
        message: 123
    }
  })
</script>

</body>
</html>